Axial flow fan



FIG. 1 is a perspective view of the fan blade of the axial flow fan;

FIG. 2 is a front view thereof;

FIG. 3 is back view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a cross-sectional view thereof taken along line 8-8 in FIG. 2.

The broken lines illustrate portions of the axial flow fan and form no part of the claimed design. 

CLAIM I claim, the ornamental design for an axial flow fan, as shown and described. 